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Thread: 87804 vs 87400

  1. #1

    Default 87804 vs 87400

    AAPC: Back to School
    Help please. I don't have a lab background and I'm confussed about the difference between 87804 & 87400. We have a test that checks for influenza, both A & B. How do I know which code to use??

  2. #2


    While researching the codes this is what I found...
    87400 enzyme immunoassay (EIA) technique.
    >Blood specimen is serum
    >Testing usually in acute phase & repeat again in 10-14 days
    >If testing performed separately for Influenza A & B; report twice

    87404 immunoassay with direct optical observation
    >infection identified by direct detection of the virus in respiratory
    secretions (throat swab,nasal aspirate, nasopharyngeal swab or
    >specimen usually collected within 1 week of onset of symptoms
    > method: EIA with monoclonal antibodies to detect viral antigen
    > Again, may bill 2 units for separate results (A & B)

    Hope this helps...
    Anthony McCallum, CPC, CIRCC, CPC-I, CCS

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